Adapter ring



FIG. 1 is an elevated, perspective view of a bottom of an adapter ring in accordance with an embodiment of my invention;

FIG. 2 is an elevated, perspective view of a top of the adapter ring;

FIG. 3 is a bottom plan view of the adapter ring;

FIG. 4 is a top plan view of the adapter ring; and,

FIG. 5 is a side view of the adapter ring, an opposing side view being a mirror image thereof.

The broken line showing is included for the purpose of illustrating portions of the article that form no part of the claimed design. 

The ornamental design for an adapter ring, as shown. 